Quick Explanation
Denial code HOS21 occurs when an Emergency Department (ED) visit is billed but denied because the care was not properly coordinated with the patient's Primary Care Physician (PCP) or Managed Care Organization (MCO). Managed care plans often require prompt notification of emergency services to manage utilization and coordinate follow-up care. Consequently, if the hospital fails to meet these contractual coordination or notification timelines, the payer will deny the claim.
Common Causes for HOS21
Denials with code HOS21 typically happen for the following specific reasons:
- Failure to notify the patient's HMO or MCO of the emergency department admission within the contractually mandated timeframe (typically 24 to 48 hours).
- Seeking emergency department services for a non-emergent condition without obtaining a referral or prior coordination from the designated Primary Care Physician (PCP).
- Inadequate documentation in the medical record demonstrating communication between the ED staff, the PCP, and the payer's utilization management team.
- Failure to follow specific post-stabilization care coordination guidelines required by the payer's managed care contract.
How to Prevent HOS21 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Establish automated alerts within the Electronic Health Record (EHR) to flag managed care patients upon ED registration, prompting immediate notification to the payer.
- Train ED registration and utilization review staff on specific payer-contracted notification windows and coordination protocols.
- Utilize dedicated care transition coordinators to document all communication with PCPs and HMO case managers in real-time.
- Implement real-time eligibility verification tools to identify restrictive managed care plans that require strict gatekeeper coordination.
Appeal Letter Template for HOS21
If you believe this claim was denied incorrectly, you can use the following template to submit an appeal.
[Your Practice Header]
[Date]
[Payer Name]
[Appeals Department Address]
RE: Appeal for Claim [Claim Number]
Patient: [Patient Name]
ID: [Patient ID]
Date of Service: [Date]
Denial Code: HOS21 - Emergency department visits not coordinated
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code HOS21: "Emergency department visits not coordinated".
We are appealing the denial of this Emergency Department visit (Code HOS21) based on the federal 'Prudent Layperson Standard' and Emergency Medical Treatment and Labor Act (EMTALA) regulations (42 U.S.C. ยง 1395dd). Under these guidelines, emergency medical screenings and stabilizing treatments must be performed without delay and without regard to prior authorization or care coordination requirements. The patient presented with acute, severe symptoms that a prudent layperson would reasonably believe required immediate medical attention to prevent serious impairment. Therefore, requiring prior coordination or penalizing the provider for post-stabilization notification delays violates established CMS and federal guidelines regarding emergency care access. The attached medical records demonstrate the emergent nature of the visit, and we request that this claim be reprocessed and approved for payment.
Attached please find:
1. A copy of the original claim.
2. The relevant medical records supporting the service.
3. [Any other supporting documents].
We respectfully request that you reprocess this claim for payment.
Sincerely,
[Your Name]
[Title]
[Practice Name]
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